Right. I got those little foil sachets (STAT) of the glue. Only problem is, the glue is crap compared to the Elmer's that came in the box when I got the trick.

I wanted to close with the effect, so applying the glue just before I do it, is great.

However, not this glue. (I am sure the glue is fine and it is my lack of experience with the effect, but it seems the other glue holds much better).

Anyhoo, any ideas about what I could do with the old glue.

I will be wearing a suit. Could I apply the glue off stage, do 15 minutes, then do the trick? It would obv stick to shirt a little but could it be sticky enough?

I tried putting the good glue into a pre ton sachet, but it dries up in the packet if there is air about into a rubbery mess.

Is there some awesome pro tip about covering it on your arm with cling film unit lyon perform? Should I just duck down behind the table and whack the Elmer's on whilst doing some hilarious and amusing patter?

Andrew Mayne has an excellent idea for applying on and getting the glue off your arm. It is all done "secretly" during your performance. Everything has a motivation.
Preparation is done before and can last for days without glue getting dried.
It is explained in Shock FX. For me it is worth a look.

The only problem is that it can appear a little less usable for those very formal show. It really depends on your character and attitude.